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Controlling an arrangement of semiconductors emitting light of distinct colors

a technology of semiconductors and arrangement, applied in the direction of electric variable regulation, process and machine control, instruments, etc., can solve the problems of requiring an even more requiring a powerful and expensive processor, and requiring the processing of said calculations

Inactive Publication Date: 2011-01-11
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]It is an object of the invention to solve the drawbacks of the prior art as described above and to provide improvements in compensating for changes of light output of emitted light for each distinguished color and wavelengths shifts dependent on changes of junction temperature of the semiconductors and, in combination, compensate for changes of emitted light power due to aging.SUMMARY OF THE INVENTION
[0009]With the method as claimed, calculations, which are required to compensate for changes of light output due to aging, can be carried out with very long intervals in a range of hundreds or thousands of hours. As a consequence the processor for carrying out all calculations can be less powerful and therefore much cheaper than before. Because of said long intervals a period for sensing and processing emitted light need not to be as short as before and need not to fall within a single PWM period. This allows for using less expensive light sensing elements.

Problems solved by technology

As a consequence, a processor for carrying out said calculation must be powerful and therefore will be expensive.
To minimize such fractions and thereby maximizing the control range of light output for each color, the light output for each color must be sensed and evaluated even faster, which requires an even more powerful and expensive processor.

Method used

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  • Controlling an arrangement of semiconductors emitting light of distinct colors
  • Controlling an arrangement of semiconductors emitting light of distinct colors
  • Controlling an arrangement of semiconductors emitting light of distinct colors

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Embodiment Construction

[0014]The lighting system shown in FIG. 1 comprises an assembly 2 of an arrangement of light emitting semiconductors, such as diodes (LEDs), and drivers for driving the semiconductors from a power supply. The arrangement of semiconductors comprises semiconductors for emitting light of different distinct colors. As an example, but not limited to that, three different colors can be used, in particularly red, green and blue, which, abbreviated to R, G and B respectively, are used as a suffix to numerals for referring to parts and signals of the system.

[0015]At some locations, such as a heat sink, of the arrangement of semiconductors a temperature is measured, which is indicated by dotted arrow 4. A junction temperature estimator 6 uses a value of the sensed temperature to determine a junction temperature 8R, 8G and 8B of each color. The estimator 6 comprises a thermal model of a luminary containing the arrangement of light emitting semiconductors. The use of such estimator is known per...

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Abstract

Controlling an arrangement of semiconductors of which different semiconductors emit light of different distinct colors is disclosed, whereby a feed forward control part, which is dependent on a junction temperature of semiconductors for each color, is operated with first intervals and is adjusted dependent on measure light output for each color with much longer second intervals.

Description

FIELD OF THE INVENTION[0001]The invention relates to a method for controlling an arrangement of light emitting semiconductors emitting light of substantially distinct colors. The invention also relates to a lighting system according to the preamble of claim 6.BACKGROUND OF THE INVENTION[0002]U.S. Pat. No. 6,441,558 discloses a LED luminary system for providing power to LED light sources to generate a desired light color. The system comprises a controller for controlling a supply or power to the LEDs. The controller comprises two parts. The first part measures a temperature of the arrangements of LEDs, it determines a junction temperature of the semiconductors for each distinguished color, and it determines a feed forward junction temperature compensation to provide an intermediate control signal which is supplied to a lumen output module, emitting a wanted output power or lumen output for each color. A second part of said controller comprises a feedback loop, which receives the outp...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H05B37/02H01L33/00H05B44/00
CPCH05B33/086H05B33/0869H05B45/22H05B45/28
Inventor DEURENBERG, PETER HUBERTUS FRANCISCUSDE MOL, EUGEN JACOBVINKEN, JACOBUS HENRICUS PETER MARTINUS
Owner KONINK PHILIPS ELECTRONICS NV
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